Ceiling.



Patented Jan. 7, |902. .l. FRECKMANN.

CEILING.

(Application led Aug'. 21, 1901.)

2 sheetsfsheet' l.

(No Model.)

Ty: Nonms FUER; Q, Muvo-nwo.4 wAsHmGToN. Dief l Patented 1an. 7, |902. .1. FRECKMANN.

CEIL N G.

(Application Sled Aug. 21, 1901.)

2 Sheets-Sheet (No Model.)

` we/afar i y 2m faam@ 2W TN: ohms Pernis co.. Puma-Limo.. wAsHmsTnu. 0u.

UNITED STATES PATENT OFFICE.

.IosEPH EEE'CKMANN, oE HILDESHEIM, GERMANY.

oElLlNe.

SPECIFICATION forming part of Letters Patent No. 690,646, dated January '7, 1902.

` Application filed August 21, 1901. Slerial No. 72,810. (No model.)

To ctZZ whom t may concern.-

Be it known that I, JOSEPH FRECKMANN, a citizen of Germany, and a resident of Hildesheim, Germany, have invented certain new .plan of a mold for making the blocks; Fig. 6,

a vertical longitudinal section thereof; Fig. 7, an enlarged cross-section thereof; Fig. 8, a side View of slide fr; Fig. 9, a vertical section, and Fig. 10 a horizontal section, of the same.

The letters o represent the main beams of the ceiling, between which auxiliary beams or supports may be arranged.

a a' are the cement blocks or plates, which are supported upon said beams and'which are molded in the manner hereinafter described. y

The blocks a a are providedv on theircontiguous ends with grooves b, Fig. 4, having zigzag channels f, Figs. 1 and 2. These grooves and channels are filled with mortar, and then the blocks` are placed closely against each other. Owing to the largeY uniting kmortar surfaces and the penetration of the mortar into the zigzag channels an exceedingly intimate and durable union of the several blocks into a continuous block or plate will be effected. The blocks may be set between the beams either in an inclined or straight direction. At their lower face the blocks d a are provided with countersunk wooden joists g',

to which is secured a support h for the plas-V ter that covers the lower side of the beams.

Between supports h and beams c a strip v of any suitable material for excluding heat or moisture may be interposed. A strip ZC serving a similar purpose may be placed upon the beams c. At the left in Figs. 1 and 2 is shown a construction to exclude moisture and at the right is shown a ireproof construction. The mold to make my improved blocks is illustrated in Figs. y5 to 10. Z represents the two sides of the mold,"whicl1 are removably connected at their ends by bolts fm, nuts n, or in similar manner. On the inner faces of Vsides Z are secured rails o, having zigzag pro blocks. Between the sides Z are interposedslides r, eitherinclined, as shown, or straight, and then the intervening spaces are packed with cement.

In order to decrease the weight of the blocks, cores t may be inserted, while angle plates-s serve to facilitate the stamping opf eration. The joists g are previously placed into the mold. To remove the blocks, the cores t are Withdrawn, the slides r removed,- and the sides Z separated by unscrewing the nuts n. l

What I claim is; y

1. Acementblock havinggroovedends, the grooves being provided with zigzag channels, substantially as specified.

2. A cement block for ceilings having' grooved endsand zigzag channels,- and with joists embedded within the blocks, substan= tially as specified.

Signed by me at the United States constilate, Hanover, this 31st day'of July, 1901.

JOSEPH FRECKMANN.

Witnesses:

RUDOLPH BARTELS, C. Q. SrEvENsoN. 

